1. Department of Pathogenic Biology, School of Basic Medical Sciences, Lanzhou University, Lanzhou, People’s Republic of China
2. Department of Gastroenterology, Wuwei Liangzhou Hospital, Wuwei, People’s Republic of China
3. Department of Gastroenterology, Affiliated Hospital of Northwest Minzu University, Lanzhou, People’s Republic of China
4. Department of Gastroenterology, First Hospital of Lanzhou University, Lanzhou, People’s Republic of China